AVK control valves are the safe choice

AVK diaphragm operated control valves are the safe choice. They are designed according to EN 1074-5 and to provide network stability, accurate regulation, easy maintenance and long durability.

AVK control valves' unique design features 

AVK control valves are the safe choice offering accurate regulation, easy maintenance and long durability: 

  • All non-coated metal parts of stainless steel AISI 316 as standard
  • Fusion bonded GSK approved epoxy coating (300 micron) 
  • AVK's own drinking water approved rubber compounds
  • Modular pilot system enables easy fitting to other applications without replacing the valve
  • Adjustment of regulating speed for full control
  • Parabolic plug design provides precise regulation and stability at low flow
  • Large diaphragm secures fast reaction to minor changes in pressure
  • Lifted seat prevents damage inside the valve body due to cavitation
  • AVK design and manufacture with 100% pressure test and 10-year warranty

Control valve with patented modular pilot system

The modular design with interchangeable parts offers great flexibility as the pilot system is easily altered to fit other or multiple applications without replacing the valve. The pilot system consists of three main components: 

  • The distribution block (1) connects the pilot system to the main valve. As a unique feature, it offers adjustment of regulating speed for full control, easily adjusted using standard tooling, and giving full control e.g. in situations, where water hammer may occur.
  • The filter (2) features high capacity and easy maintenance. When using the optional flush valve it also offers easy access to cleaning, while the valve is in operation. 
  • The hydraulic control block (3) can be set up for different applications. It features easy hand adjustment of the balanced pilot valve which is capable of very precise settings. 

Modular pilot system for AVK control valves

The external pipework takes up less space and is less vulnerable to damage during installation compared to many other control valves. It is designed using components with standard threads offering easy sourcing of replacements as well as easy fitting using standard tools. All metal parts are of stainless steel AISI 316.

High quality materials

The body and bonnet are made of ductile iron with fusion bonded GSK approved epoxy coating. The diaphragm is manufactured by AVK GUMMI and made of drinking water approved EPDM rubber with polyamide reinforcement. All non-coated internals are of stainless steel AISI 316 and all materials are WRAS approved. 

Large diaphragm design (1) secures fast reaction to changes in pressure. Support below the diaphragm gives less stress near closed position.

Lifted seat design (2) prevents damage inside the valve body caused by cavitation. 

Parabolic plug design (3) provides precise regulation and stability at low flow. Furthermore, it reduces noise and vibration. See characteristics, illustrating the performance compared to a standard flat plug design.

Design features of AVK control valves

Control valves with reduced and full bore

AVK control valves are available in DN50-600, in reduced and full bore versions. Control valves with reduced bore are appropriate for most applications, as the smaller bore often offers more accurate regulation. Control valves with full bore are recommended, if high Kv values are needed, e.g. in front of hydrants, or if very low head loss is required.


Control valves

Features and function of our control valves series 859


How to maintain the pilot system on an AVK control valve

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